Method for recycling positive-negative electrode defective materials of waste lithium waste lithium cobalt oxide lithium-ion batteries

Abstract

The invention discloses a method for recycling positive-negative electrode defective materials of waste lithium waste lithium cobalt oxide lithium-ion batteries. By combing technologies such as high-speed impact crushing, vibration screening, anaerobic atmospheric roasting, wet-type magnetic separation and temperature-variable filtration, products such as elemental cobalt, lithium carbonate and graphite powder are prepared from the positive-negative electrode defective materials of waste lithium waste lithium cobalt oxide lithium-ion batteries; the materials are separated and enriched in such manners as high-speed impact crushing, vibration screening and wet-type magnetic separation, the original physical properties of the materials are retained, the negative electrode graphite material is fully utilized, the in-situ preparation of resources is achieved and the cost is saved; the anaerobic atmospheric roasting is adopted, the reaction conditions are relatively loose, the graphite material loss is decreased, the flow is simplified, any chemical agent is not needed in the entire process, no secondary pollution is caused and the industrial application practice is facilitated. By the method, the problem of pollution-free treatment of leftover material generated in the manufacturing of the lithium-ion batteries for battery manufacturers is solved and meanwhile, a method for mining secondary mineral, namely, a cobalt resource is provided.

Description

technical field [0001] The invention relates to resource recovery of valuable components of waste lithium-ion batteries, especially an effective environmental-friendly resource recovery method for positive and negative electrode scraps and scraps produced in the production process of lithium cobalt oxide batteries, and belongs to the electronics industry in the field of environmental protection. Waste treatment, recycling field. Background technique [0002] In 2011, the global shipment of lithium-ion batteries was about 4.298 billion, and the market size reached 92.4 billion yuan, an increase of 24.16% compared with 2010. It is estimated that from 2012 to 2020, portable lithium-ion batteries and power lithium-ion batteries will continue to grow at a compound growth rate of 7.58% and 26.84%, respectively. In 2020, the global lithium-ion battery market will reach 386.6 billion yuan. With the widespread application of lithium-ion batteries, their use is increasing year by yea...

AI Technical Summary

Problems solved by technology

[0008] The current resource recycling process of lithium-ion batteries is mainly a hydrometallurgical process combined with acid leaching and solvent extraction. In the process of processing lithium cobalt oxide battery electrode materials, cobalt leaching and chemical advanced treatment are required, resulting in a large amount of high The high concentration of chemical acid-base waste liquid will cause secondary pollution, and the commercial extraction agent will increase the treatment cost

And concentrate on the extraction of valuable metals cobalt and lithium in positive electrode materials, ignoring the recycling of other resources

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